Abstract: The device for the fireproof lead-through of wires, cables, pipes and the like through openings in walls has a frame-shaped housing for a number of cuboidal packing pieces. The latter include two sealing elements with cross-sectionally semi-cylindrical inserts inserted in them. The inserts are formed on their inner side with at least approximately semi-annular ribs and on their outer side with semi-annular ribs and with semi-annular grooves located between the ribs. The sealing elements likewise have substantially semi-annular ribs and grooves equal and opposite to the grooves and ribs on the outside of the inserts. The inwardly protruding ribs of the inserts are located radially inside the semi-annular grooves located on the outer side of the inserts and the ribs are deformable, whereby they penetrate into the grooves located outside lines, pipes, cables and the like of different diameters inserted into the inserts to effect adaptation to them.